package org.bouncycastle.jce.provider;

import java.security.interfaces.RSAPrivateCrtKey;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;

import org.bouncycastle.crypto.params.RSAKeyParameters;
import org.bouncycastle.crypto.params.RSAPrivateCrtKeyParameters;

/**
 * utility class for converting java.security RSA objects into their org.bouncycastle.crypto counterparts.
 */
public class RSAUtil {
    static public RSAKeyParameters generatePublicKeyParameter(RSAPublicKey key) {
        return new RSAKeyParameters(false, key.getModulus(), key.getPublicExponent());

    }

    static public RSAKeyParameters generatePrivateKeyParameter(RSAPrivateKey key) {
        if (key instanceof RSAPrivateCrtKey) {
            RSAPrivateCrtKey k = (RSAPrivateCrtKey) key;

            return new RSAPrivateCrtKeyParameters(k.getModulus(), k.getPublicExponent(), k.getPrivateExponent(), k.getPrimeP(), k.getPrimeQ(), k
                    .getPrimeExponentP(), k.getPrimeExponentQ(), k.getCrtCoefficient());
        } else {
            RSAPrivateKey k = key;

            return new RSAKeyParameters(true, k.getModulus(), k.getPrivateExponent());
        }
    }
}
